new zealand; soakage design manual - auckland city

SOAKAGE DESIGN MANUAL AUCKLAND CITY August 2003

Appendix A Drawings

No. Title 1 Nominal Soakhole 2 Onehunga Soakhole 3 Filter-strip and Soakhole 4 Rain-garden (soakage and pre-treatment) 5 Rockbore Soakhole 6 Porous Paving 7 Rain-garden (pre-treatment only) 8 Scoria Trench 9 Settling Chamber (for roof runoff) 10 Sand-filter – Definition Sketch 11 Rainwater Tank – Definition Sketch

'bird cage' recommended

Spouting

Building

Roof water

Bou

ndar

y

Ground profile - topsoil or paving

Dep

thSe

e no

te 3

Length See note 3

300

3000 MIN

Water Table

3000 MIN

SILT

Excavate pit, wrap sides and top with Profel(or similar) filter cloth and backfill with 20/50 grade clean scoria.

Dep

thSe

e no

te 3

MIN

300x450 Catchpit to collect site and

ground water only

TRAP

Subsoildrain

Extend perforated pipe or draincoil into pit

100mm uPVC Half Syphon

solutions for your environment

PATTLE DELAMORE PARTNERS LTDAuckland Wellington Christchurch

AJ88

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ONLY FOR SMALL OUTBUILDINGS AND HOUSEEXTENSIONS LESS THAN 20m²

Notes :

1. All dimensions are in mm (unless otherwise specified)

2. This type of soakpit is only suitable as a pit. Strip soakpits are not acceptable.

3. Provide 1m³ of soakpit for every 10m² of impervious area. Maximum depth 1.0m.

4. Soakpit shall be positioned NOT closer than 2.0m to any sanitary sewer.

Ground level

PERF Pipe

Soaktrench

OVERFLOW

Use

pre

cast

MH

for d

epth

s ov

er 1

500m

m

Soaktrench

OVERFLOW

SECTION

PLAN

300

MIN

1500

MAX

Dep

th

Specific design 1500Ø manhole lidwith central opening

Specific design 1500Ø manholelid with central opening

uPVC sewer grade pipe, sized from Table A.

-Runoff from roof areas must pass through a settling device. Refer to Drawing 09.

-If the total paved area exceeds 20m², site runoff must be pre- treated. Refer to Drawings 07, 08, 10.

Cast iron lid& frame

Standard precast base on 75mm thick

scoria basecourse

20/50 clean scoria

200x200x400mm Vibrapac conc blocks

200x200x400mm Vibrapac conc blocks

Edge of soakhole excavation

Edge of 1500mm precast MH lid

20/50 clean scoria

Project No. :

Title :

Drawing No. :Scale: NTS

Project :

Client :


PATTLE DELAMORE PARTNERS LTDAuckland Wellington Christchurch

Revision :

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Notes :1. All dimensions are in mm (unless otherwise specified).

2. Exact depth to be determined by site soakage test rate and contributing area.

3. Soakholes shall not be located within 3.0m of buildings or boundaries or 2.0m of sanitary sewers without specific geotech report.

4. An operation and maintenance plan is required. Refer to Form SM001.

5. Soakholes may not be located within any building or in a subfloor/basement carpark.

Table AMAX Catchment Area*

MIN Overflow Pipe Size (mm)

210 m2 100

350 m2 125

550 m2 150

1000 m2 200* Measured as equivalent (tick) impervious area

1000

MIN

200 MIN

Gravel filled trenchto distribute runoff

Site runoff

Clean drainage aggregate(e.g. 20/7) or decorative rock

200

MIN

500 MIN

Filter fabric,Bidim A14 orsimilar. Line top, bottomand sides. Overlap 300at joins.

Observation well of100Ø perforated pipe.See Note 4.

Scoria 20/50Perforated drainagepipe. Wrap end infilter fabric.

Site runoff

Roof runoff fromSettling Chamber.Refer to Drawing 09.

300

MIN

Slope of filter-strip = 1%

Length of filter-strip determinedby pre-treatment calculations

Push-on end cap

Exact soakhole dimensionsto be determined from sitepercolation tests

Roof runoff fromSettling Chamber.Refer to Drawing 09.

1001

Revision :

Auckland Wellington ChristchurchPATTLE DELAMORE PARTNERS LTD


Client :

Project :

NTSScale: Drawing No. :

Title :

Project No. :

1. All dimensions are in mm (unless otherwise specified).

2. Soakholes must not be located within 3.0m of buildings or boundaries or 2.0m of sanitary sewers.

3. An operation and maintenance plan is required. Refer to Forms SM002 and SM008.

4. Observation well to be uPVC sewer grade, with at least 4 10Ø holes per 100 length and anchored at base.

SECTION

PLAN

Notes :

1000

MIN

Scoria 20/50

Site runoff

Observation well of 100Ø perforated pipe.uPVC sewer grade, with at least 4 10Ø holes

per 100 length and anchored at base.

500 MIN

Site runoff

500

MIN

150

MIN

1000

MIN

Short grassed strip (optional)

Driveway or Patio

Perforated drainage pipe, sized from Table A.Wrap end in filter fabric.

Shape raingarden to suit site.Exact dimensions to be determinedfrom site percolation testsand pre-treatment calculations.

Push-on end capCatchpit, sized from Table B

100

MIN

Overflow to be directed toa suitable overland flow path

Sandy loam soil

Filter sand (e.g. NRB F/5 OR alternative)

uPVC sewer grade pipe

Standard DWV couplerglued on PVC side andwired on Novacoil side

Earth batter

Roof runoff fromSettling Chamber.

Refer to Drawing 09.

Roof runoff fromSettling Chamber.

Refer to Drawing 09.Filter fabric, Bidim A14 or similar. Line top,bottom and sides. Overlap 300 at joins.

50 MIN

Revision :



Client :

Project :


Title :

Project No. :


2. Raingarden must not be located within 30m of buildings or boundaries or 2.0m of sanitary sewers.


Notes :

SECTION

PLAN

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210 m2 100

350 m2 125

550 m2 150

1000 m2 200

(tick)Table BMAX Catchment Area*

MIN Catchpit Size (mm)

210 m2 300 x 300

350 m2 300 x 300

550 m2 450 x 300

1000 m2 450 x 300* Measured as equivalent (tick) impervious area

Grate cap Galvanised iron steps

Ground level

BOU

ND

ARY

1500 Min

500 MIN

1000 MIN

1500 MIN

depth

Break out rock and backfill with free draining hardfill

2000 MIN

1050mm or 1200mm precast manhole riser

uPVC liner pipe grouted into rock

100mm Drilled bore MIN - number to be determined by size of development and results of test drilling. Multiple bores to be staggered in height

Entry head loss up to 50%

Cast iron lid and frame -heavy duty in road reserve/ public and sealed areas -standard duty elsewhere

uPVC sewer grade pipe, sized from Table A.

-Runoff from roof areas must pass through a settling device. Refer to Drawing 09.

-If the total paved area exceeds 20m ², site runoff must be pre-treated. Refer to Drawings 07, 08, 10.

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Title :

Project No. :

Notes :


2. Depth will vary depending on type of ground encountered.

3. If rock is deeper than shown, then construct manhole on standard precast base.

4. The drilled bore is to be positioned under the MH access for ease of cleaning.

5. ARC requirements:- Where 1000m² or more of impermeable area is to be drained to ground soakage, a Resource Consent will be required.

6. Soakholes may not be located within any building or in a subfloor/basement carpark.

7. Refer plan No. 12908/201 for precast manhole construction details.




210 m2 100

350 m2 125

550 m2 150


30 M

IN

Bedding material(e.g. NRB F/5 OR alternative)

Porous paving(e.g. Firth Enviropaver, Formpave)

Base materialEITHER:(a) Open graded crushed aggregate (e.g. PBC 40); OR(b) no-fines concrete with 30% voids MIN

Frame and cover to suit landusePush-on end cap

Observation well of 100Øperforated pipe, anchored atbase. At least one well for every 100m² of paving.

Filter fabric, Bidim A14 or similar.Lines top, bottom & sides.

Overlap 300 at joins.

150

MIN

400

MAX

Revision :



Client :

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Title :

Project No. :

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2. Maximum slope = 3% unless baffles installed. These must be designed specifically to suit the site.

3. The porous base material must not be located within 1.0m of buildings or boundaries.

4. Only approved pavers may be used e.g. Firth Enviropaver or Formpave Aquaflow (all layers must have a minimum permeability of 2.5 x 10 m/s, and blocks must have proven long term performance).

5. Area to be paved must not be excessively travelled by heavy construction equipment either before or after paving installation.

6. Excavation to design depth should be left until all other construction is complete. Once paving is installed, it should only be used by light vehicles (unless otherwise specified by the manufacturer).

7. Paving to be installed according to manufacturers specification.


Notes :

3% =100

3

-4

Scoria, 20/50

Site runoff

Filter fabric, Bidim A14 or similar. Overlap 300 at joins.

500 MIN

Site runoff

500

MIN

150

MIN

Sandy loam soil

Filter sand, NRB F/5 or similar

200

MIN

To soakage device

To soakage device

To soakage device

To soakage device

100Ø Perforated drainage pipe.Wrap end in filter fabric.

uPVC sewer grade pipe,sized from Table A

Lining, see note 2

Catchpit, sized from Table B

Shape raingarden to suit site.1m² of raingarden for every14.3m² of paved area.

Push-on end cap

100 Overflow to be directed to

a suitable overland flow path

Short grassed strip (optional) Earth batter

1000

MIN

Observation well of100Ø perforated pipe.

uPVC sewer grade, with atleast 4 10Ø holes per 100

length and anchored at base.

Driveway or Patio

50 MIN

Revision :



Client :

Project :


Title :

Project No. :


2. Use sealed impervious lining if within 3.0m of buildings or 2.0m of property boundaries, otherwise use filter fabric. 3. Not to be located beside retaining walls or within 2.0m of sanitary sewers.


Notes :

SECTION

PLAN

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210 m2 100

350 m2 125

550 m2 150

1000 m2 200

(tick)Table BMAX Catchment Area*

MIN Catchpit Size (mm)

210 m2 300 x 300

350 m2 300 x 300

550 m2 450 x 300

1000 m2 450 x 300* Measured as equivalent (tick) impervious area

Decorative rock, decorative stones or drainage material

Observation well of 100Ø perforated pipe. uPVC sewer grade,with at least 4 10Ø holes per 100 length. Pipe to be anchoredat base, with one well for every 10m length of trench.

Perforated drainage pipe, sized from Table C. Wrap end in filter fabric.

Scoria, 20/50

Filter fabric, Bidim A14 or similar. Line top, bottom and sides.Overlap 300 at joins.

Filter sand, NRB F/5 or similar

450

200

400

300

150

Scoria trench

Boundary

Driveway

fall

Soakhole

House

1500

MIN

1500

MIN

1500 MIN to boundary

Revision :



Client :

Project :


Title :

Project No. :


2. Trench not to be located beside retaining walls or within 2.0m of sanitary sewers.

3. Slope of trench to be between 0.5% and 5%.

4. Maximum driveway gradient of 5%.

5. Catchment to be less than 500m² equivalent impervious area.

6. 1.0m of trench to be provided for every 15m² of paved area.


Notes :

SECTION

TYPICAL APPLICATION

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Table CMAX Catchment Area*

MIN Pipe Size (mm)

210 m2 100

350 m2 125


5100

5% =

Building

Ground level

Chamber, 600Ø x 900 deepwith internal base and lid

Splash pad

Leaf separator or alternative system(e.g. hedgehog or wire netting in spouting)

1000 MIN

uPVC half syphonuPVC sewer grade pipe,

sized fron Table D

Revision :



Client :

Project :


Title :

Project No. :


Notes :

AJ88

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Table DMAX Roof Area

MIN Pipe Size (mm)

210 m2 100

350 m2 125

550 m2 150

1000 m2 200

(tick)

Sedimentation chamber

Access

Overflow

UnderflowFilter sand

400

MIN

Filtration chamberSite runoff Catchpit

Note: Minimum orifice diameter is 10mm. All orifice must be screened, and details of the screen must be submitted for approval.

A p p e n d i x A 2 0 0 3

A U C K L A N D C I T Y S O A K A G E M A N U A L

Drawing 10: Sand-filter – Definition Sketch

Drawing 11: Rainwater Tank – Definition Sketch

Connection to soakage system

new zealand; soakage design manual - auckland city

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